The attenuation effect of the MKA splitters is due to absorption and resonance.

The splitters have a mineral wool infill as absorption material. Part of the splitter surface that runs parallel to the airflow is covered with resonating panels. These panels start oscillating due to the sound (resonance) and hence absorb sound energy. Resonance works best in the frequency range of critical fan noise.

There is a higher attenuation across a wider frequency range when compared to mere absorption splitters.

Splitter thickness

100, 200, 230 mm

Nominal sizes

150 × 500 mm – 1499 × 2500, 2500 × 1499 or 1500 × 1500 mm

Height subdivided

2501 – 5000 mm

Length subdivided

1501 – 3000 mm

Intermediate sizes

In increments of 1 mm

Operating temperature

Up to 100 °C

The length (L) of sound attenuator splitters refers to the airflow direction

Quick sizing tables provide a good overview of the insertion loss and of differential pressures for different airway widths and airflow velocities. Intermediate values can be calculated with our Easy Product Finder design programme.

The sound power levels LWA apply to sound attenuators with a cross-sectional area (B × H) of 1 m².

The differential pressures apply to sound attenuators with a height of 1 m.

MSA, MKA, XSA, XKA, RKA, air-regenerated noise

vs

m/s

4

6

8

10

12

14

16

18

20

LWA

dB(A)

21

31

38

43

48

51

55

58

60

MKA100, MSA100, insertion loss and differential pressure

L

S

Centre frequency fm [Hz]

vs [m/s]

L

S

63

125

250

500

1000

2000

4000

8000

4

10

20

L

S

De

Δpst

mm

mm

Hz

Pa

500

40

4

10

11

13

21

27

24

18

5

32

>80

1000

40

5

13

20

23

31

38

32

26

7

44

>80

1000

60

5

11

17

19

28

32

27

21

5

33

>80

1500

40

6

16

30

32

42

48

40

34

9

55

>80

1500

60

6

14

25

28

38

41

33

27

6

38

>80

1500

100

4

10

14

19

29

28

19

14

5

29

>80

2000

40

8

19

39

42

50

50

49

42

11

66

>80

2000

60

7

16

32

36

47

50

40

34

7

44

>80

2000

100

5

12

19

25

37

35

23

16

5

32

>80

2000

200

3

9

10

17

25

15

9

8

4

25

>80

2500

40

9

22

48

50

50

50

50

50

12

77

>80

2500

60

8

19

40

45

50

50

47

40

8

50

>80

2500

100

6

14

24

30

45

41

27

19

6

34

>80

2500

200

3

12

12

21

33

19

12

11

4

26

>80

3000

40

10

25

50

50

50

50

50

50

14

>80

>80

3000

60

9

22

48

50

50

50

50

46

9

56

>80

3000

100

7

16

28

36

50

47

31

22

6

37

>80

3000

200

2

14

15

26

41

24

16

14

4

27

>80

MKA200, MSA200, insertion loss and differential pressure

L

S

Centre frequency fm [Hz]

vs [m/s]

L

S

63

125

250

500

1000

2000

4000

8000

4

10

20

L

S

De

Δpst

mm

mm

Hz

Pa

500

50

5

7

19

21

26

22

17

14

9

58

>80

500

100

2

4

12

12

15

11

9

8

5

31

>80

1000

50

6

16

33

39

41

39

26

20

11

67

>80

1000

100

4

10

22

23

26

19

13

11

6

35

>80

1000

200

2

7

13

12

12

10

8

6

3

21

>80

1500

50

9

22

44

50

50

50

34

25

12

75

>80

1500

100

5

15

32

33

37

25

16

14

6

40

>80

1500

200

3

9

19

18

15

12

10

7

4

23

>80

1500

400

1

6

10

8

8

6

4

4

2

15

61

2000

50

12

29

50

50

50

50

43

29

13

>80

>80

2000

100

6

19

42

44

47

31

19

17

7

44

>80

2000

200

4

12

25

23

18

15

12

9

4

25

>80

2000

400

1

8

13

10

10

8

5

5

3

17

67

2500

50

14

38

50

50

50

50

49

35

15

>80

>80

2500

100

8

25

50

50

50

38

23

18

8

48

>80

2500

200

5

16

30

29

23

16

13

10

4

28

>80

2500

400

2

10

16

13

12

9

6

5

3

18

72

3000

50

17

48

50

50

50

50

50

40

16

>80

>80

3000

100

10

30

50

50

50

44

26

19

8

53

>80

3000

200

6

19

35

35

27

17

15

11

5

30

>80

3000

400

3

13

19

15

14

10

7

6

3

19

77

MKA230, MSA230, insertion loss and differential pressure

L

S

Centre frequency fm [Hz]

vs [m/s]

L

S

63

125

250

500

1000

2000

4000

8000

4

10

20

L

S

De

Δpst

mm

mm

Hz

Pa

500

60

3

7

16

19

21

17

14

14

9

57

>80

500

115

2

5

11

12

13

10

9

10

5

31

>80

1000

60

7

13

27

30

35

25

18

18

10

66

>80

1000

115

4

10

20

20

22

15

12

13

6

35

>80

1000

230

1

7

12

10

8

4

6

8

3

20

>80

1500

60

11

19

38

41

49

33

21

21

12

74

>80

1500

115

7

14

28

28

30

20

15

15

6

40

>80

1500

230

2

10

18

15

10

6

9

9

4

23

>80

2000

60

15

24

50

50

50

42

25

25

13

>80

>80

2000

115

9

19

37

36

39

26

18

18

7

44

>80

2000

230

3

13

24

19

13

8

11

10

4

25

>80

2000

460

0

7

10

3

0

0

3

3

3

16

64

2500

60

19

30

50

50

50

50

29

28

15

>80

>80

2500

115

12

24

46

44

47

31

21

20

8

48

>80

2500

230

4

16

29

24

16

11

13

12

4

27

>80

2500

460

0

9

13

4

0

0

5

3

3

17

69

3000

60

24

36

50

50

50

50

32

32

16

>80

>80

3000

115

14

28

50

50

50

36

24

23

8

52

>80

3000

230

4

19

35

29

18

13

15

13

5

29

>80

3000

460

0

11

16

6

0

0

7

3

3

19

74

Sound attenuator splitters used for the reduction of fan noise and air-regenerated noise in air conditioning systems. Attenuation effect due to absorption and resonance. Energy-saving as well as hygiene tested and certified.

The total weight of a splitter sound attenuator is the combined weight of the casing (with standard flange or angle section frame) and all splitters.

The total weight for intermediate sizes can be generated with our Easy Product Finder design programme.

MKA100, weights

H

Glass fibre fabric (-F)

Glass fibre fabric and perforated sheet metal (-L)

H

L [mm]

H

500

750

1000

1250

1500

500

750

1000

1250

1500

mm

kg

300

2

3

4

5

6

3

4

5

6

8

600

4

5

7

8

10

5

7

9

11

13

900

5

7

9

11

13

7

10

13

16

18

1200

7

10

12

15

17

9

13

16

20

24

1500

8

12

15

18

21

11

16

20

25

29

1800

10

14

19

23

27

14

19

25

31

36

MKA200, weights

H

Glass fibre fabric (-F)

Glass fibre fabric and perforated sheet metal (-L)

H

L [mm]

H

500

750

1000

1250

1500

500

750

1000

1250

1500

mm

kg

300

4

5

6

7.5

9

4

6

7

9

11

600

6

8

10

12

15

7

10

12

15

18

900

8

11

14

17

20

10

14

17

21

25

1200

10

14

18

22

26

13

18

22

27

32

1500

13

17

22

27

31

15

21

27

33

40

1800

16

22

28

34

40

19

27

34

42

50

MKA230, weights

H

Glass fibre fabric (-F)

Glass fibre fabric and perforated sheet metal (-L)

H

L [mm]

H

500

750

1000

1250

1500

500

750

1000

1250

1500

mm

kg

300

4

5

7

8

10

5

6

8

10

12

600

6

9

11

14

16

8

11

13

16

19

900

9

12

16

19

22

11

15

19

23

27

1200

11

16

20

24

28

14

19

24

30

35

1500

14

19

24

29

34

17

23

30

36

43

1800

18

24

31

37

44

21

29

37

45

54

Installation details, Basic information and nomenclature

Installation details

Basic information and nomenclature

Upstream conditions after bends, junctions or a narrowing or widening of the duct, vertical upstream section, splitters upright

B Width of the sound attenuator
H Height of the sound attenuator

Installation and commissioning

Splitters are supplied as ready-to-install kits

Follow the installation information and comply with the general codes of good practice in order to achieve the given performance data

Up to height H = 1200 mm: any installation orientation, but we recommend upright installation of splitters

From height H = 1201 mm: upright installation only

The length (L) of sound attenuator splitters and splitter sound attenuators refers to the airflow direction; be sure to note how width, height and length are defined, particularly in case of a vertical airflow

Installation in ducts outside of closed rooms requires sufficient protection against the effects of weather

Principal dimensions

ØD [mm]

Outer diameter of the spigot

ØD₃ [mm]

Outer diameter of circular silencers

L [mm]

Length of attenuator/silencer including spigot (in airflow direction)

L₁ [mm]

Length of acoustic cladding and acoustically effective length

B [mm]

Attenuator width and duct width (upright splitters)

H [mm]

Attenuator height and duct height (upright splitters)

T [mm]

Splitter thickness

S [mm]

Airway width

n [ ]

Number of flange screw holes

m [kg]

Weight

Nomenclature

fm [Hz]

Octave band centre frequency

LWA [dB(A)]

A-weighted sound power level of air-regenerated noise

De [dB]

Insertion loss

V [m³/h] and [l/s]

Volume flow rate

Δpst [Pa]

Static differential pressure

All sound power levels are based on 1 pW.

All values were measured in a TROX lab and to EN ISO 7235. Intermediate values may be achieved by interpolation.

Lab measurements exceeding 50 dB are indicated as 50 dB, in line with common practice.

Your message is send and will be processed shortly.Our department for Service-Requests will contact you asap.For general question regarding products or services you can also call:Tel.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051

Your message is send and will be processed shortly.Our department for Service-Requests will contact you asap.For general question regarding products or services you can also call:Tel.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051